[msvcrt] short tty reads don't imply EOF

[Damjan Jovanovic]

This fixes Java 1.4.1's jdb (without it, you type in the first
command, and then it exits, because the length of the user input is
less than the buffer size specified in the read!).

Changelog:
* For ttys, short reads don't mean we're at the end of the file.

Damjan Jovanovic
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